Spring-tooth harrow



t e e m e e W N0 R R A H PT 0 m G VN Patented Apr. 5,1892.

xhtmeow (No Model.) 2 SheetsSheet 2. F. VAN PATTEN.

SPRING TOOTH HARROW.

No. 472,185. Patented Apr. 5,1892.

" NITED STATES ATENT firmer);

SPRING-TOOTH HARROW.

SPECIFICATION forming part of Letters Patent No. 472,185, dated April 5,1892. Application filed January 8,1890. Serial No. 336,326. (No model.)

To all whom it may concern.-

Be it known that I, FREDERICK VAN PAT- TEN, a citizen of the UnitedStates, residing at Auburn, in the county of Cayuga and'State of NewYork, have invented a new and useful Spring-Tooth Harrow, of which thefollowing is a specification. 1

This invention relates to spring-tooth harrows; and it has for itsobject to construct a harrow of this class which shall possess superioradvantages in point of simplicity, durability, and general efliciency.

With these ends in view the invention consists in the improvedconstruction, arrangement, and combination of parts, which will be.

hereinafter fully described, and particularly pointed out in the claims.

In the drawings hereto annexed, Figure 1 is a perspective view of aspring-tooth harrow embodying my several improvements. Fig. 1 is aperspective detail view of one end of the barrow-bar, showing the recessor cutaway portion. Fig. 2 is a longitudinal vertical sectional viewtaken through the main barrow-beam and one of the spring-teeth secureddirectly to the same. Fig. 3 is a longitudinal vertical sectional viewtaken through the main barrow-beam, one of the extensionbars, and thespring-tooth secured to the latter. Fig. 4 is a perspective detail viewof one of the spring-tooth seats. Fig. 5 is a perspective detail view ofone of the extension-bars. Figs. 6, 7, 8, 9, and 10 are perspectivedetail views illustrating modifications in the con-- struction of thespring-tooth seats and the extension-bars.

Like numerals of reference indicate like parts in all the figures.

The main frame-bar of my improved harrow may be constructed in a singlepiece; but it is preferably, as shown in the drawings hereto annexed,composed of two parts or pieces 1 1, connected at their adjacent ends bya hinge-joint 2. The upper sides of the parts composing the mainframe-bar are channeled or provided with a concave groove 3, extendingthrough the length of the said frame-bar.

The upper sides of the parts 1 1, composing the main frame-bar, areprovided at suitable intervals with recesses 4 to accommodate thetooth-seats 5 or the extension-bars 6, which are bolted, riveted, orotherwise suitably secured to the frame-bars 1 1, alternating with eachother. It will be observed by reference to Fig. 1 that in the formationof these recesses only a very small quantity of material at the upperedges of the ground or channeled bar requires to be removed, thus notdetracting materially from the strength of the bar. The tooth-seats arecomposed of metal plates having slots 7 and curved upwardly in thedirection of their widths, as shown clearly in Fig. 4 of the drawings,so as to form the lugs or ears 8 8, the under sides of which affordseats or bearings for the transverse bolts 9, upon which are pivoted thecam-plates 10, having set-screws 1l,adapted to press or bear against theshanks of the spring-teeth 12, which latter are in practice insertedunder the cam-plates, and are thus held by the conjoint action of thesaid cam-plates and the set-screws.

The extension-bars consist of metallic bars or plates of suitablelength, the inner ends of which are secured to the frame-bars and theouter ends of which are provided with toothseats of the constructionjust describedthat is, the outer ends of said extension-bars areprovided with slots 7 and are curved or bulged upwardly to form the lugsor ears 8 8, forming bearings for the pivotal bolts of the camplates.The central or intermediate portion of each of said cam-plates is alsopreferably curved upwardly for the purpose of more readily clearing anyobstructions that may be encountered.

The construction of the individual springteeth is no part of my presentinvention. By arranging the tooth-seats alternately with theextension-bars two separate rows of teeth are practically formed withoutthe use of crossbars or other devices to obstruct the passage of hardclods and other obstructions. By securing the tooth-seats and theextension-bars in the recesses 4 all tendency to lateral vibration isprevented, which is very desirable. To assist in accomplishing thelatter purpose, the tooth-seats and extension-bars are preferablyprovided on their under sides with transverse fianges 13 to engage thefront and rear sides of the main frame-bar. The upper sides of theframe-bars 1 1 may also be provided with upwardly=ertending lugs orstuds, as

shown at 14, to bear against the sides of the tooth-seats and theextension-bars.

In practice the spring-teeth may sometimes be bolted directly to themain frame-bars or to the outer ends of the extension-bars, and Ireserve the privilege of so doin Various modificationsin theconstruction of the tooth-seats and extension-bars might also beadopted, and in the drawings hereto annexed several such modificationshave been shown. Thus in Fig. 6 I have shown a toothholder consistingsimply of a plate 15, having downwardly-extending transverse flanges 16,adapted to bear against the front and rear sides of the main frame-barand provided with upwardly-extending longitudinal flanges 17 to preventlateral vibration of the springtooth, which, together with the seat, issecured to the frame-bar by a single vertical bolt. In Fig. '7 thetooth-holder is shown to consist of a plate having downwardly-extendingtransverse flanges to engage the frame-bar and upwardly-extending lugs18, which are perforated to receive the pivotal bolt 19 of a camplate20, having set-screw 21. In Fig. 8 the tooth-holder consists of a platehaving later ally-extending flanges 22 to receive the securing bolts orrivets and upwardly-extending cars 23, through which passes a transversebolt or pin 24. The cam-plate 25, having the set-screw 26, is providedin its upper side with a transverse groove 27 to engage the pin or bolt24:. In Fig. 9 an extension-bar is shown consisting of a channel-bar28,the side flanges of which 29 are provided with series of perforations30, in any of which may be adjusted the transverse pin or bolt 31, onwhich is pivoted the cam-plate 32, having the set-screw 33. By thisconstruction the spring-tooth is made capable of adjustment upon theextension-bar. In Fig. 10 an extension-bar is shown provided at itsouter end with flanges 3 for the transverse pin or bolt 35, upon whichis pivoted the cam-plate 36, having the set-screw 37.

Numerous other modifications might be devised, and I merely select theforegoing for the purpose of illustrating.

The harrow-bars 1 1 are provided with forwardly-extending brackets 38,which are connected by link-rods 39 with the evener-bar 40, whichconsists of a longitudinally grooved or channeled bar which may beformed by bending or doubling a plate or strip of sheet metal of properdimensions upon itself. Centrally to the evener-bar is secured a clevis41, to which is attached a whiflletree constructed in the same manner asthe evener-bar and provided at its ends with draft-hooks.

The operation and advantages of this invention will be readilyunderstood by those skilled in the art to which it appertains from theforegoing description, taken in connection with the drawings heretoannexed.

The general construction is exceedingly simple and inexpensive and is ofsuch a nature as to enable any one of the spring-teeth to be easily andquickly detached or replaced, as occasion may require.

By attaching extension-bars to the main frame and applying the harrow-teeth both to the frame and the extension-bars I am enabled to use aset of teeth of the same size and yet secure the alternate double rowsof teeth, as shown.

Prior devices, as far as I am aware, have heretofore increased the sizeof the outer row of teeth in order to form the alternate set; but thiscourse is open to objection, and I aim to avoid it by the presentimprovement.

Having thus described my invention, I claim and desire to secure byLetters Patent of the United States- 1. In a spring-tooth harrow, thecombina tion, with a frame-bar, of extension-bars secured at rightangles thereto, and the springteeth secured to said extension-bars andto the frame-bar alternately with the extensiombars, substantially asset forth.

2. In a spring-tooth harrow, the combination of a frame-bar, thetooth-seats and ex- .tension-bars secured to said frame-bar alternatelywith each other, and the spring-teeth secured to said tooth-seats andextension-bars, substantially as set forth.

3. A spring-tooth holder consisting of a plate having a longitudinalslot, said plate being curved upwardly in the direction of its width toform ears or bails at the sides of said slot, in combination with a pinor bolt inserted under the said bails above said slot, a cam'platemounted pivot/ally upon said pin or bolt, and a set-screw extendingthrough said cam-plate and bearing against the upper side of thetooth-holder, substantially as and for the purpose set forth.

4:. In a harrow employing a series of equalsized extension-bars whichare secured to the main frame-bar, the attachment of one set ofharrow-teeth to the outer end of said extension-bars and another setdirectly to the main frame-bar intermediately between eachextension-bar, both sets of teeth being of the same size, so as to causethe harrow-teeth to arrange themselves in two alternate rows, as setforth.

In testimony that I claim the foregoing as my own I have hereto affixedmy signature in presence of two witnesses.

F. VAN PATTEN.

Vitnesses:

J AMES LYON, CHARLES L. PRICE.

